Andrew Barr and Richard Johnson of the National Post put together an excellent infographic on global nuclear arsenals. Check it out here: here.

“…trying to catalogue the nuclear warheads in the world is an almost impossible challenge. Secrecy aside, every country has different ways of tallying their arsenals (a weapon may be listed as decommissioned and not tallied, but could be made viable again.)This graphic attempts to look at the number of immediately available nuclear weapons in the world; weapons that could at a very short notice — because that is the point — be used in a war. Taking the latest data available from the Bulletin of the Atomic Scientists we have constructed a graph of instantly available launch devices — missiles with nuclear warheads installed and ready to fly or drop.”